"powerpc_debugfs_root" not exist on linux-4.4.123 for powerpc arch.

[Sombat Tragolgosol]

My system: ps3
OS: Gentoo linux

Today, I've tried to update my Linux kernel jump from 4.4.100 to 4.4.123.
I'm not sure and perhaps this source tree is still active maintenance. If
not I'm really sorry for my disturbance.

Compile source problems:

1) missing "debugfs.h" on arch/powerpc/include/asm path
2) setup-64.c need to be fixed for adding debugfs.h on above path

I find "github.com/torvalds/linux" adding a year ago, but it is still
missing for current linux-4.4.123 source tree.

For another version higher, I don't try yet.

Thanks in advance.
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